Read the docs
TI-2026-76928 Aliases CVE-2026-113599GHSA-rg3x-36vj-2j2w

Insecure direct object reference in Modoboa API auto-reply creation

Priority LOW 24CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

Modoboa before 2.8.0 contains an insecure direct object reference that lets authenticated users create auto-reply messages for arbitrary mailboxes by supplying another user's mbox value. Attackers can inject attacker-controlled auto-reply subject and content into victims' settings, or break their auto-reply management through MultipleObjectsReturned errors. The flaw is an authorization bypass through a user-controlled key (CWE-639), and an attacker needs only a low-privileged authenticated account.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Modoboa before 2.8.0 contains an insecure direct object reference vulnerability that allows authenticated users to create auto-reply messages for arbitrary mailboxes by supplying another user's mbox value. Attackers can POST to /api/v2/armessages/ to inject attacker-controlled auto-reply subject and content into victims' settings or break their auto-reply management via MultipleObjectsReturned errors.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0034 27th percentileScored 2026-11-07
Fix Fixed modoboa (modoboa): 2.8.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
modoboamodoboabefore 2.8.02.8.0Patch availableCNA
  • modoboa Vendormodoboa Affected before 2.8.0 Fixed in 2.8.0 Patch available CNA

Remediation

Upgrade modoboa to version 2.8.0 or later, which fixes this flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA modoboa (modoboa) Fixed in 2.8.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    modoboa 2.8.0

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-76927 Insecure direct object reference in Modoboa alarm bulk deletionPriority LOW 24
    Show all 2 records →

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-113599
  2. 2026-10-20 CISA SSVC decision points changed
  3. 2026-10-21 Alias added: GHSA-rg3x-36vj-2j2w

References

Patch 1

Other 3

  • TI-2023-02089 Improper Authorization in modoboa/modoboa CVSS 3.1CRITICAL 9.1
  • TI-2023-05233 Cross-Site Request Forgery (CSRF) in modoboa/modoboa CVSS 3.1HIGH 8.8
  • TI-2023-02028 Weak Password Requirements in modoboa/modoboa CVSS 3.1CRITICAL 9.8
  • TI-2023-00737 Authentication Bypass by Primary Weakness in modoboa/modoboa CVSS 3.1CRITICAL 9.8
  • TI-2023-00815 Improper Restriction of Excessive Authentication Attempts in modoboa/modoboa-installer CVSS 3.1HIGH 7.5
  • TI-2026-21988 Modoboa has an OS Command Injection CVSS 3.1HIGH 7.2
See all 18 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences